Article ID Journal Published Year Pages File Type
5413033 Journal of Molecular Liquids 2010 9 Pages PDF
Abstract
Synthesis, characterization and thermal properties of a series of four azomethines (1)-(4) derived from 4-biphenyl carboxaldehyde were described. The structures of the azomethines were characterized by means FTIR, 1H, 13C NMR spectroscopy and elemental analysis; the results show an agreement with the proposed structure. The methods of differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) were used to describe the liquid-crystalline properties of the azomethines. The mesomorphic properties of the compounds depend on the amine used in the synthesis of imines. In particular, three of them prepared from 4-hexadecylaniline, 4-decylaniline or 4-((4-aminophenyl)diazenyl)-N,N-dimethylbenzenamine (1)-(3) showed smectic A and smectic X mesophases, while the last one obtained from 4-(heptadecafluoroctyl)aniline (4) exhibited SmX2 and nematic mesophases. Current-voltage measurements were performed on ITO/compound/Alq3/Al device with two different thicknesses of the film. Additionally, we compared the mesomorphic behavior of the azomethines presented in this work with another azomethines.
Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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